exam Maths Puzzle Numerical Ability

A plan flies 300 miles with a tail wind in 1 hour. It takes the same plan 2 hours to fly the 300 miles when flying against the wind. What is the plane's speed in still air?

Read Solution (Total 0)

exam Other Question

In 1990, the St. Louis metropolitan area had an average of 82 x 10^-6 g/m^3 of pollutants in the air. How mant grams of polltants were there in 2 x 10^3 m^3 of air? find the z score that separates the middle 63% of the distrubution from the area in the tails of the standard normal distribution
The z scores are___